McDonnell & Miller 11MV Millivolt Switch for Low Water Cut-Off Controls

The McDonnell & Miller 11MV is a millivolt automatic reset snap switch designed as a replacement component for McDonnell & Miller low water cut-off controls. This switch is compatible with models 61, 64, 67, 69, 70, 764, and 767 series controls, providing reliable switching functionality for boiler safety systems.

Key Features:

• Two-pole double break switch design for dependable low water cut-off protection
• Automatic reset functionality for continuous operation
• Millivolt service rated for compatibility with low-voltage boiler control systems
• Direct replacement for worn or failed switches in compatible McDonnell & Miller controls
• Factory part number 309200

This switch features two single pole, single throw switches - one controlling the water feeder (terminals 3 and 4) and one providing low water cut-off protection (terminals 1 and 2). The millivolt rating makes it suitable for use in both standard AC and millivolt-powered boiler control applications. Designed for steam and hot water boiler safety systems in residential, commercial, and industrial applications.